Master knife, also known as bell knife, ring knife. It is the Manchu, Zhuang, Miao, Yao, Dong, Tujia, Han and other nationalities who shake the body and sound musical instruments. It is called Hama knife in Manchu, and Shaman knife in Northeast. Popular in Liaoning, Jilin, Heilongjiang, Guangxi, Guizhou, Hunan, Hubei and other regions.
Master knives are generally made of steel or iron, and there are many styles. Most of them are made of small iron rings installed on the handle of ordinary knives and scissors. The Manchu master knife in the Northeast region is 75 cm long, 60 cm long, 10 cm wide, 15 cm long, and has an oval metal trim 10 cm long and 8 cm wide. Around the tip and the decorative piece, there are several small holes drilled respectively, and each hole is pierced with three to five small iron rings connected in series.

The master knives in Gui, Qian, Hunan, Hubei and other places are connected with a large iron ring at the end of the hilt, and several small iron rings are worn in the large ring. There are also some small iron rings in the handle of the iron scissors!